DEVELOPMENT FOR NEW SCRAP-IRON MELTING PROCESS SUPPRESSING EXHAUST CARBON DIOXIDE

在高炉、污泥熔炼炉和高频熔炼炉研究成果的基础上，对焦炭床反应器氧化废铁熔炼炉进行了研究。采用含碳材料压型法对氧化废铁进行还原，并测定了压型煤的还原动力学。通过基础实验研究了焦化竖炉内的气体流动、固体流动和固体熔化等现象。然后，考虑焦炭的燃烧、焦炭的气化和固体铁的凝固等化学反应，建立了熔炼炉的数学模型，并通过数值计算研究了最佳操作条件。所得结果总结如下：1)型煤还原率的制定。2)还原性气体到固体铁的凝固速率测定。3)锻铁熔化温度的测定。4)固体碳到固体铁渗碳速率的测定。废铁熔炼炉数值模拟。

On the basis of the results obtained from researches for blast furnace, sludge melting furnace and high frequency melting furnace, the research on the melting furnace of oxidized scrap-iron was carried out for coke bed reactor.Briquetting method included carbon materials was adopted for the reduction of oxidized scrap-iron, and reduction kinetics of briquette was measured. Various phenomena such as gas flow, solid flow and melting of solid in the coke-bed shaft furnace were examined by the fundamental experiments. Then, mathematical model of the melting furnace was constructed with considering some chemical reactions such as combution of coke, gasification of coke and curbrization of solid iron, and optimum operating condition were investigated by numerical calculation.The results obtained summarized as follows ;1) Formulation of the reduction rate of briquette. 2) Measurement of curbrization rate from reducing gas to solid iron. 3) Measurement of melting temperature for curbrized iron. 4) Measurement of carburization rate from solid carbon to solid iron. 5) Numericcal simulation of scrap-iron melting furnace.